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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08f4faa69bb61cd01a7a56faf0df6fcd81ed8325e4ccf528fd1bbadc614e21e' 
  AND token = 'yDXLlID5yLAhhVdAdpddD1S2lLbog0sXvsUPUZV2/I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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