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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf1c748a30b09b1ecc12edfa0c298a645916d7e46123211b7fb6960576d7f90' 
  AND token = 'foA7YEGaAULR6QG3ye3jXHxGc55rMmWea+mZSn5nAns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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