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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d9bbda93f805c4e1793cb67349997efb07942c0c194728d9994d094dd8b9b8' 
  AND token = '3rwcRo08DKbeA2koYBov07L10+w2t+Q8SGJ2didXDes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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