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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708f0170033e57289cd617e83717f9219f5c4696590af1b25e1625ff67e18837' 
  AND token = 'iNZ4FPS7n8gctWmk/ZHG6juF7Kuy6RXGZVoZbCqMV5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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