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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f751e41be1558920e3343cd1efc7d2680ad5d978d8aec16771a6f6c4586bc1f' 
  AND token = '0Xef+xEO6bV3Slfhed2uQd1HKaMNKeNflppxOTEJzqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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