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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5ace56ed12bbd0de33c4618330e69fe58e391f484a548d32f10d5ba2733977' 
  AND token = 'fexy2fgNSeKfqKqwvX+Z+Lhv5cl8uw92C2SnxS4E1/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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