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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df013f958d215bc882061c9bca9d9e399ee0ccf6ceb5edc27e8de50ab4c6b4e' 
  AND token = 'B19ycb2YIuhMeKft9QCCg/JK4Oks421L9zuLwIP/vNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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