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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ac522f2971195912961b1e28f402af2c7b48f94bc2e3e54bd5a40a9fbe560c' 
  AND token = 'kL1HNO7GBFAFckUZxl7MAmnqBAYMdd3a7/FhezjsUp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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