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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfd76b4535e51b319b200ebc390f1a51f61a41b0b4d6e91d5aafeecba4d7e37' 
  AND token = 'kU6ynlVpfwImTqz4n+DCMSmwN+Wbs0DF9I0wfEMAALs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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