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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71f823d1ef0ec505f6b3d7426ec764ff844247f64366a30cd0d9c0230600927' 
  AND token = 'SCS5+ZDPRbj+xglPqPgrTh037PZ1xUye0h/oZ1eJduc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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