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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd0e66e72ea1f5de54815f5a99f1fe1097092ec33f0bb809e1bb45ce1854c3c' 
  AND token = '0TSfPuLu+Nvs1iKE15B1IwKKGG5B8VyNQEprzWUv1KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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