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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6b8b1c54d41b91e902d82675c9cbe8aa8b0568ea34de8307bb647f7fd55055' 
  AND token = '48Ho2ySFNzNek9NYWoGpTqS9yR4RkTwU0cLSVtu0aIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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