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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67596b87a3b7aeed156a7d72a9c29e96d4a0045d1b7bf38f4e4c44bf9e4709b' 
  AND token = 'NZknQmZOoqkUgcYeKG68VHs8fAW0HjQ6qnaEPIrrrPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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