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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f407eb7bad0c0851b57be5ef2eef1f22ba571c8c286216f8022373aac147d518' 
  AND token = 'sx+HZy6H3N0eJ/EtXUKpTbhhxMVTfsSKSo05498U7Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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