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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3ba4e140bba397347172283b795e4714ff1a487314cc654625633dfc22d157' 
  AND token = '0/AdhENiAeEfFWJsd069ksoNYK2x9JVrYWOFCp7aMKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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