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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7399ae27123d0c1af09a8baf82393a405d00e66cc09ff08f7cbfa1c3be41ef5c' 
  AND token = 'O2sy3/ijIgv4enA8SqOnu0EzqJJYihv7zZLYk3iLy3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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