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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1273715fe9fd8caf513e3f96e16ba1de7ac99fc70218ea7376988d7d3e1883' 
  AND token = 'weBhmIHWgih886ECHvM+VnznmKnCp+hupMD75Azz9Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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