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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bc4432605c61bab3aaac29e448309f23f36779608938e03593e8e1b9cafb95' 
  AND token = 'Kv5LG6Hqg8LJ3O7Po0YuOg/qOdsrEaOUE5d72s+KZRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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