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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c98e5e3b6f6060a60287a6dc62849e18fa48594066252f68f61202b54c4a93' 
  AND token = 'zWDuA56IW//17Zx96KAPRywuRhdwCevXT2dwr6KQffg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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