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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa943c58a3818430d1524e6223309bb41c5c32bb90a0b2956d7fb78f2b39a81d' 
  AND token = 'f5ds5xyc7ST4p9RT8c8ubq/DoBbpBbfF6kE0zmK7noY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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