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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da61bf17494a96c24cdea057fa02c470d2238efdb9ee64f3e3219e15614258b5' 
  AND token = '6LIymQEGWPjO0cZ1bXiBoq8vAfNaKfMB+QHF6dxWX6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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