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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a18279af627024c0ab9af8cb0d1ad7a36ec90116d48e3ac717e704cd3f9780e' 
  AND token = 'm8nyRTiEPlTughjPNLVCuJSuC9nA7bZCxwX1xPAlUGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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