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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e33471c526a4ee6e2b78be5340e0e992c1a28cbc18f71ed2872fdeaf2c7915' 
  AND token = 'aYM+lCCiDuGZZHkm4Rkbv5/xDTFM6kBpdd0tazCOSuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}