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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b5575511dd81501cb4e8241d51948cce051982db51a6a499c85075c6bb7b47' 
  AND token = 'TMLcGP8g/fbwjSI2sOCxB8QiapvkVc1CN+3oR3sVnb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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