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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ae879ef8b6d239c24eb226f9a02e9be42beb9f68a9d5a5f3ecd765cae00197' 
  AND token = 'DFQ4lHuxQDEcYqHj9hmiZwKgr8WlbyIc5+1oxHLhR/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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