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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c9ce25ce6d77c1c7e73876504eeec2ea5bc1790e14a929f1b216cd8559cc2c' 
  AND token = '5b093EwH4J6E7P3h4lh2o61OxwnI/thLHEWOKeRlXw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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