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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ee05a07e9a520b030e4cc2e24064e203b8db247dd38d8fe65b5e9667fbfad8' 
  AND token = '2KxDseQbcDKbTrpK//U0/1IVxL3vDdK9bcToMoRgE8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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