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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912e24fc8b568e9edbc41f338827e98e3ed69f873603657f207e0abfca7da745' 
  AND token = 'KqrC7+osHlMPM3DXW5dA9F5qtF9Gvwnqcr+f8IFEV/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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