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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8911d929a21333123354b42e6b85c2050d5a8544f3258281cf62f6d297e35235' 
  AND token = 'X57plJm/h2u9H+uh8t1uttPc/isS2PiV0NdNQKqCbNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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