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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ab412d32377182965cad5fb8ae91986f3fdfab179ec273bf70e6a08342cf28' 
  AND token = 'abVBPj3S/fMz9TvmbHRCWpp2ta+0ISz5MdbErnCVPCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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