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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6a539a83fc45b7c631db35c84e876972f799b77fcb0838c0ec612604607ab5' 
  AND token = 'j016JgLLmnyppnXthSi9lumM1LR83wS1szLo81AKdHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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