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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edebe01d280ecab5d2ca45bc9e01333956f77efbe52a046ad479de0a0d5cf357' 
  AND token = 'Dl9v8KM00m4kJcP73Ai5SjybAVV8WDI1/OdFh7N2AvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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