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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1533f2a03f8e707c6ea99b6c04ef9fe2e4d1a310ae6aa850ea088bebc9e134' 
  AND token = 'wbl2tTnJQ2Asopupok7Egblgxk+gU+FCLUEP8v2eh98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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