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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47decd2ef4d25f9d64d0521bfaf4880a0d0e505687625d7615f55cef420f7856' 
  AND token = '5HXKQkdQKBH3UpT94v7pQK0Hply2LFOBOAvHbIrx+xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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