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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f027f0f8e569b995ebc692c7730f221545d736e8fd710e1d3f0ecf339992b99' 
  AND token = '6cRL/GVDtjnVAssvdSJhfTI9W1TF8h5+IUfBNbuwMWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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