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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2c5ef9c7cb0eb81a5bd7c11341b8c05a3c4a41302ac95f2756fb6d034c0c6a' 
  AND token = '1d8CUhQFuC/InHwWznRakPsHsDiLqjJcYs93feWbSgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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