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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89097d061fc662b237036a07f9990a6f766224ed1e6600b0f769f589e3af53f3' 
  AND token = 'qjBI8SIZJjZ9Qo+RkyY7WiHydTCZGHP8nxXw3CbP5s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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