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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be63dfacd0d7cf614897da72e01ebbe932022274523e8c4a3599aaefeb252c79' 
  AND token = 'lR4rqtGprO8pXCJdLgtMguEY9Btz+2xyHFpWQl+TmFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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