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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d81cae4f006dd930a260aafbea84f6065a8f698c0b1c3f0056156a62ff3d6d9' 
  AND token = '6VpAItSTMqcGzyHifShtYWVAksKJ56Wij6/la3eLEWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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