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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0e93b200c7e386ad55754ec205443f10e10a17e89092c65d125accf06640ca' 
  AND token = 'B+SYgad1Fd8qKja/6o8S+eyKZSn8e3VcZF5wRuCq4hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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