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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdadd17303dcba463c84e7a11b4e3ed8698379bfdc93d60bd1c117b89b4233c' 
  AND token = 'QTf+rU6jezTktEDzITQtpVIW6OzP1reVWWTQn/36A5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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