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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154be2e7bd1f099789c8481a476cb83153a28e7f3da11fa432119b51c0c7c49a' 
  AND token = '1kbZ8idIAIKFpPO4AdknmvLNVD+/+ICkG8x7gFt/fBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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