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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e5b8af55abd360676eb31fd7cf8335c7e80f52769a58c1047e4c40b1a1ddd6' 
  AND token = '1MZR4ga2JXJkTWrgHw6gHSpNyLkry2tibiRQE8qN7bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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