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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b2fa6930d4bb1eb93393e50ea6638517284353e95bbd96445d5beed2503c10' 
  AND token = '4BmXglEpdc3NWpyX1KQ/t4lmGIZTxKetnhtQ5QhDIsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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