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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6acc4bda4c2c05dcc128177b1e13b8d8a54979eb7b9e4c5451d9d04b4bc75ac' 
  AND token = 'BE6vqPHHVOfphaRrCMdpZebB6pd1rGsUX7ss9BI7FW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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