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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9992b6e6d92eadb7b032f12a54ef96dcbe89753e88f6f8302fcdb9edc45cc2e' 
  AND token = 'wM3wRzz1vtD/sWH3+dOslixLgo31vS1LPyWspmavWEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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