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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599eda700d3ab309b202ddad8b6ff5dc16c2c01a69fc1b2c4fa64e72ac88fbfe' 
  AND token = 'tj97by9A9YEQUr32+OnEOr4/SUGafmc/jKm+UwKJzKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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