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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ee74312666783b03996db7dd12883d5d24fba1388409b7784bf5926447a302' 
  AND token = 'yR/+atus0t0TBKigiJ7NHWS5h4ghm5dQeZ5TAHN0yJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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