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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f91ff2da9b6ddb6c40c6adc07e179dfb1c1f0de25a4ce5fe2f2d1cf1b6d7d88' 
  AND token = 'Afes7NhmM23lJ98T8sxWfOm7Z6dOSa17bzC92pmpy0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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