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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1d9a125bf969b6c82957ab9c4150ee1972830065c4d6c04262bcb0e57e1393' 
  AND token = '6Jfgfed9lmt2VTXEEPMkem4hJ8edu8lVxORPOrupdkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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