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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f02f6fbb5e3bfce8400a5892575004817f1fe3005c446284d1165aeddbad335' 
  AND token = '8OOmJzAttT/KN0YSqz1TpEPpthztlIV1nhd8dtDe5sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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