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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3a30bd44c32b1ae07b890274c5f0c497e80a95f9c920598d4dde32b1c76563' 
  AND token = 'FUgJRr7+gntljIK5TTtmENK6uPLx/0dG2SPlaTI+3F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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