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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5ade22e2828bd340999fa255c807978aba89ba74598c36a38f1fac44a48306' 
  AND token = 'B4NESpGPbpGeXpHHjs1wESBdiIox8gc0z6EXW9568Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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