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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61dbe87a1d08ce5a155a25a3b7e81e1bd342105e930e2811226dcb0a13fc8be' 
  AND token = '+dywG6tAmJmXPlCO9RbdCICR5FDAYT+bq3k7n5nSFxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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