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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd509ce6825342a2d7b913fe98547bcf1992c6c9b85c691c4211ce1d1951a33be' 
  AND token = 'ILxrqevSLOV78M0ZqwaAPpqucXy5rorUnZog6HtWu24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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