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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f451cb5c5ad9846dac8b0d7fe902e8bc95af8be2a6610d96536c4d3df4d9318' 
  AND token = 'KWnKYtsXQT6WlAC1egmR8sLXhLCSEKUMlBAn8ufe8Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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