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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941f1c9f1648f74c0e543220187957afb274f4d8ccfba093058328a8e93516a5' 
  AND token = 'AAE07kXjCD8qco+pB6T2YIoXDfp06c2v+nbzGY4uUqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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