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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b822e7858a4f8136ee8ecc16c7ec98c5fd2b22b6fcfbb932960b4316d914eaa' 
  AND token = 'nx6ePjIs/1M83tIcDPfziw0qVl/92CaCUoGWxlAEE0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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