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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0fb34a06144d34cae5872ab04b966b6e823ab34a4b9c24e61a99b6d770ed92' 
  AND token = 'YCcV7aQjJy9U1mSLzvyApORN2WlWiR8U6opEXGpTMYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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