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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62e4941dcfe40c2d4c76886438a8de0eb086e25385cb5b9ebfb4c4948e5cb1a' 
  AND token = '6AOXnBn+unFqM2AA66liiA8K1XqGtOrFCwFLJKU3hlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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