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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e6e607b63f8b8516f9a7324a8967037b7473114b3e4d087824db17b7d21751' 
  AND token = 'd76xBoHPXJSfsmYyne9xxMKQmCU/M2ALbV9pharvaFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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