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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b852d0b8668bc383d1b9bc20b3d11b204e343a60b5b7b9f99f01dd607d11fe' 
  AND token = 'qgIXWTLGyk139rOlc5r8Hrr36naSDHtpKQvvMOwcrW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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