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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca78f8e1652fe739d490f45b6548a723650d17c59f67655b474f763757126e71' 
  AND token = '5YktJAIZUAm2ahyVgNINx8cYvhkKn6NvTXCIXGsiGmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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