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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cd115d823d897f8549c30e63033e8d2475a532ca78b8ee0e45fce01109bba9' 
  AND token = 'yXLegx5SLIRXhLR+bstFv1z+1S8sOXWpkPkuJrY/rl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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