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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e507179ef09bcefa5f78ebd4f9917e70aa2e25d390f73ab565457471beb14f6' 
  AND token = 'c4vRT159C7WMaPFgnnZTTpfy/EcY08DIvVhtH3sSats=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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